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Which of the following statements about bags is ALWAYS true? A bag is implemented as an...

Which of the following statements about bags is ALWAYS true?

A bag is implemented as an interface to a dynamic data structure.

A bag prevents duplicate values from being inserted.

A bag is unordered, so it is not concerned with the ordering of the items it contains.

A bag is implemented as an interface to a static data structure.

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A bag is unordered, so it is not concerned with the ordering of the items it contains.

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